Microwave runs (light and turntable on, fan running) but does not heat food at all.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Critical Safety Warning: The high-voltage system inside a microwave is extremely dangerous. Do not attempt to test or replace the magnetron, transformer, capacitor, or diode unless you are trained and know how to safely discharge the capacitor.
- Basic checks: Confirm you are using microwave-safe containers and that the power level is set to 100% (High). Try heating a cup of water for 1–2 minutes.
- If still no heat: Unplug the microwave and discontinue use. The issue is almost certainly in the high-voltage system.
- Professional repair: A technician will test the magnetron, transformer, capacitor, and diode and replace the failed component(s).
Because of the risk of electric shock and radiation leakage if improperly repaired, no-heat conditions should generally be handled by professionals.